System Aspects of Antenas MCQ’s

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This set of RF & Microwave Circuit Design Multiple Choice Questions & Answers (MCQs) focuses on “System Aspects of Antenas”.

1. Gain of an antenna is always greater than the directivity of the antenna.
a) True
b) False

2. A rectangular horn antenna has an aperture area of 3λ × 2λ. Then the maximum directivity that can be achieved by this rectangular horn antenna is:
a) 24 dB
b) 4 dB
c) 19 dB
d) Insufficient data

3. If an antenna has a directivity of 16 and radiation efficiency of 0.9, then the gain of the antenna is:
a) 16.2
b) 14.8
c) 12.5
d) 19.3

4. A rectangular horn antenna has an aperture area of 3λ × 2λ. If the aperture efficiency of an antenna is 90%, then the directivity of the antenna is:
a) 19 dB
b) 17.1 dB
c) 13 dB
d) 21.1 dB

5. A resistor is operated at a temperature of 300 K, with a system bandwidth of 1 MHz then the noise power produced by the resistor is:
a) 3.13×10-23 watts
b) 4.14×10-15 watts
c) 6.14×10-15 watts
d) None of the mentioned

6. The noise temperature of an antenna is given by the expression:
a) radTb + (1-rad) Tp
b) (1-rad) TP
c) radTb
d) None of the mentioned

7. If an antenna has a directivity of 16 and is operating at a wavelength of λ, then the maximum effective aperture efficiency is:
a) 1.27λ2
b) 2.56λ2
c) 0.87λ2
d) None of the mentioned

8. With an increase in operating frequency, the background noise temperature:
a) Increases
b) Decreases
c) Remains constant
d) Remains unaffected

9. Low is the G/T ratio of an antenna, higher is its efficiency.
a) True
b) False

10._________ has a constant power spectral density.
a) White noise
b) Gaussian noise
c) Thermal noise
d) Shot noise

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